ragweed
名词 ragweed:
widespread European weed having yellow daisylike flowers; sometimes an obnoxious weed and toxic to cattle if consumed in quantity
同义词:ragwort, tansy ragwort, benweed, Senecio jacobaea
any of numerous chiefly North American weedy plants constituting the genus Ambrosia that produce highly allergenic pollen responsible for much hay fever and asthma
同义词:ambrosia, bitterweed